Nonreturn valve



Patented May 7, 1929.

UNITED STATES PATENT OFFICE.y

GEORGE C. DAVIS, or CHICAGO, ILLINOIS, ASSIGNOR To G. M. DAVIS REGULATOR i COMPANY, or CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS.

' NONRETURN: VALVE.

Applicationiled March 14, 19.27. Serial N'o. 175,290.

i My invention relatesto improvements in nonreturn valves where it y1s Vdesirableto have an exceedingly sensitive valve which y will respond to very slight changes in pressure and where the valve will be absolutely tight without the introduction of any special or separate packing means and whereinv the valve parts will offer a minimum resistance to flow in the open direction and wherein the floating valve members may be adjusted, replaced and manipulated with a minimum of diiiiculty and complication. Other objects will appear from time to time in the course of' the specification and claims.

My invention is illustrated more or less diagrammatically in the accompanying drawings, wherein- Figure l is a side elevation of the valve;

Figure 2 is a section along the line .f-2 of Figure l;

Figure 3 is a section along the line 3--3 of Figure 1.

Like parts are indicated by like charac ters throughout the specification and drawis the'valve casing;v A1 the intake and A2 the discharge pipe so that gas or air flows through the valve in the direction Shown by the arrow. .The underside of the housing is bounded by a curved'wall as at A3; the upper side which is open terminates in a flange A4 extending clear across the area of the valve. A5 is an extension housing adapted to be bolted to the flange A4 and closed by the cap A". v

The inside of the housing is flanged as at YB. Resting on this flange and held seated' thereon by means of the set screws B1 B1 are a plurality of grid member B2 B2 extendingy across thev effective opening ofl the valve.

' Spaced beyond the down-stream side of these grid members on the down-stream side thereof is a bridge B3 held in. place by the studs B4. Obviously the grid might be made integral with the valve housing and the exten'- sion housing might be integral with the balance of the valve housing though it is more convenient to make them as indicated. Under some conditions the body'of the valve housing itself might be used as a substitute for the bridge. o

C C are valve plates or shoes of such width as to bridge the gap between adjacent grid members, there being one separate Shoe to close the entire space between each adjacent pairof grid members. The grid members are provided with bearing ribs C1 on their down-stream faces lprojecting abovethe body of' the grid adapted to be engaged by the shoe. These lmembers are provided so that each shoe 'may be ground into place on its part of the grid, thereby making a tighty closure when the shoe is seated. Projecting voutwardly from the down-stream side of each shoe are two or more lugs C2 C3. These lugs make ay close 'working fit on a flexible Shoe supporting spring bar C'i which is an- Chored by the pin C5 in one of the lugs only to permit differential expansion andy contraction of the bar and the yshoe while holding the shoe 'firmly 'Y in place on the bar against longitudinal or rotary movement with respect to the bar. Each spring bar extends upwardly and is socketed in a boss C8 on the underside of the cover A6 being held in position therein by a pin C7. It will be noted that the axis of the socket in the boss is slightly inclined and this axis if projected are thrown back` against the grid by the elasticity of the spring bary and by the pressurefof the flowing fluid and close the valve. Thevalve plates. are removable as a unit with the capA, and the grid members tied together as they are by the peripheral ring B5 are also removable as a unit fromy the housing by releaseoof the set lscrews B1 so that both the grid and the plate may be easily removed for repair, renewal or change. The'long housing through'which the spring rods or bars extend upwardly away from the vgrid permits these bars to be long enough so that liexure or bending is on such a long arc and so slight in degree that crystallizationand breakage is reduced to a minimum.l The Socketing of each spring bar Separately in the housing and the bending of each bar togetherwith its socketing in the back of the shoe and the pinning of the bar there enables each Vbar to definitely and accurately position each shoe` and bring it always back into Working relation with the seat on the grid, thus rotation or displacement of the valve shoe is reduced to a minimum and the shoe is always returned to its normal seating position without the use of any guiding or positioning means other than the bridge or other stop which prevents the shoes being driven too far away from their seats.

It will be evident that while I have shown in my drawings an operative device, still many changes might be made in the size, shape, arrangement and disposition of parts without departing materially from the spirit of my invention and Wish, therefore, that my showing be taken as in a sense diagrammatic.

' I claim: n f 1. A non-return valve comprisingvan apertured valve seat a shoe ada )ted to rest upon the seat and close the aperture and an elonin which the end of the member is received and hoiding means passing through the- Walls ofthe socket and the flexible member.

Signed at Chicago7 Acounty of Cook and tate of Illinois, 'this 8thv day of March, 1927.

GEORGE c. DAVIS. 

